Royals don’t set taxes.

There is a 23 billion blackhole in the budget so we’re told. I think a one off tax of just 10% on Musk based on his total global net worth could be in order.

To paraphrase another King "Will no one rid us of this turbulent billionaire?

without the consent of the Congress, accept of any present, emolument, office, or title, of any kind whatever, from any king, prince, or foreign state.

He’d just buy enough congress people to get it passed.